/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.impl.client;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.http.annotation.NotThreadSafe;
import org.apache.http.entity.HttpEntityWrapper;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.ProtocolException;
import org.apache.http.protocol.HTTP;

/**
 * A wrapper class for {@link HttpEntityEnclosingRequest}s that can be used to
 * change properties of the current request without modifying the original
 * object. </p> This class is also capable of resetting the request headers to
 * the state of the original request.
 * 
 * 
 * @since 4.0
 */
@NotThreadSafe
// e.g. [gs]etEntity()
public class EntityEnclosingRequestWrapper extends RequestWrapper implements
		HttpEntityEnclosingRequest {

	private HttpEntity entity;
	private boolean consumed;

	public EntityEnclosingRequestWrapper(
			final HttpEntityEnclosingRequest request) throws ProtocolException {
		super(request);
		setEntity(request.getEntity());
	}

	public HttpEntity getEntity() {
		return this.entity;
	}

	public void setEntity(final HttpEntity entity) {
		this.entity = entity != null ? new EntityWrapper(entity) : null;
		this.consumed = false;
	}

	public boolean expectContinue() {
		return false;
	}

	@Override
	public boolean isRepeatable() {
		return this.entity == null || this.entity.isRepeatable()
				|| !this.consumed;
	}

	class EntityWrapper extends HttpEntityWrapper {

		EntityWrapper(final HttpEntity entity) {
			super(entity);
		}

		@Deprecated
		@Override
		public void consumeContent() throws IOException {
			consumed = true;
			super.consumeContent();
		}

		@Override
		public InputStream getContent() throws IOException {
			consumed = true;
			return super.getContent();
		}

		@Override
		public void writeTo(final OutputStream outstream) throws IOException {
			consumed = true;
			super.writeTo(outstream);
		}

	}

}
